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If you are trying to use your 3/8 mount you may be out of luck. There are adapters to go from 3/8 to NMO but none that I know of from NMO to 3/8. Sorry, but I couldn't find any either. You are probably better off getting a new mount and buy any antenna you want instead of restricting your selection.
Since those type antennas usually require a tapped loading or matching coil they need a connection to ground at the base. The standard 3/8 mount does not provide that connection hence the lack of antennas for 2m/70cm with that kind of base connector.
You could go with a 1/4 wave 2 Meter whip with a 3/8-24 mount. A 1/4 wave at 2M is equal to 3/4 wave at UHF: Hence a dual band antenna. Only catch is the gain is 0 dB at 2M and 1.5 dB at UHF. Not high gain, but workable.
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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